Preheat the oven to 425 degrees.,Spread the pesto all over the crust of the pizza. Use extra pesto if desired.,Drop the ricotta cheese in dollops all over the pizza.,Sprinkle the mozzarella on top of the ricotta.,Add the artichokes, sundried tomatoes, and mushrooms.,Sprinkle the parmesan and walnuts on top.,Finish with cracked black pepper.,______